Restart your phone
Press and hold the Power button
Tap Restart or Reboot
If there is no restart option, power off the phone completely
Turn the phone back on after a few seconds
Remove the case if it is pressing any buttons
Check that the Volume Down button is not stuck
Make sure no buttons are being held during startup
Uninstall any recently installed apps if the phone keeps returning to Safe Mode
Check for system updates
If needed, back up your data and perform a factory reset